cli-cv.md - Document new options for standalone admin

docs/general/cli-cv.md

@@ -120,6 +120,17 @@ There are several available options for the installer. Expand the topics below f
 
     __Note__: At time of writing, the sample data is only supported in the default locale, `en_US`.
 
+??? info "Option: Admin User (Standalone)"
+
+    ```
+    cv core:install ... -m extras.adminUser=USERNAME \
+      -m extras.adminPass=SECRET \
+      -m extras.adminEmail=ME@EXAMPLE.COM
+    ```
+
+    When installing CiviCRM Standalone, you should specify the credentials for the first administrative user.
+    If omitted, the credentials will be auto-generated and stored in the CiviCRM log.
+
 ??? info "Option: Verbose output"
 
     ```bash